PERFORMANCE OF A WATER GAS SHIFT UNIT PROCESSING PRODUCT GAS FROM BIOMASS STEAM GASIFICATION

摘要

In this present paper, the performance of a commercial Fe/Cr based catalyst for the water gas shiftrnreaction was investigated. The catalyst was applied in a water gas shift pilot plant which processed product gas fromrna commercial biomass steam gasification plant for combined heat and power. The water gas shift pilot plantrnsuccessively processed product gas upstream and downstream a rapeseed methyl ester gas scrubber. During therninvestigations, extensive chemical analyses were carried out. The main components (CO, CO_2, CH_4, N_2, O_2, C_2H_6,rnC_2H_4, and C_2H_2) and sulfur components (H_2S, COS, and C_4H_4S) were measured. In addition, tar and NH_3 analysesrnwere performed. Furthermore, the catalyst’s activity was observed by measuring the temperature profiles along thernreactors of the water gas shift pilot plant. During the operation, no catalyst deactivation could be observed. A COrnconversion up to 94 % was reached. The results showed that the application of a Fe/Cr based catalyst in a water gasrnshift unit seems to be a suitable way for increasing the hydrogen content in the product gas which was generated byrnbiomass steam gasification. Furthermore, with such a technique it is possible to adjust the required CO/H_2 ratio forrnseveral syntheses reactions (e.g. methanation, Fischer Tropsch) in an optimal way.